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How Does Machine Espresso Work?

Machine espresso employs precise pressure and amazing filter technology to make the delicious coffee we enjoy. How exactly does it work?

Espresso is created by forcing hot water under high pressure through finely-ground coffee. The process is similar to making drip coffee but the difference is in the pressure.

The Group Head

As the name suggests the group head is the place you place your portafilter while making espresso. It disperses the water into the portafilter, and regulates the pressure of the extraction. There are several different types of group heads each with its distinct advantages and disadvantages. Some are focused on temperature stability, while others on pre-infusion features, and others are designed to control the lever. Some include a combination like the E61. This is a favorite among baristas due to the fact that it has multiple advantages in one package.

As you can see in the photo above the head of the group has a number of notches. You place your portafilter into these notches and twist the head to secure it. A rubber gasket is located within the notches to create a seal while you insert your portafilter. The notches on the head permit an exact placement of the portafilter, which is essential to ensure an even extraction.

Apart from allowing you effortlessly insert your portafilter the group head is also responsible for maintaining an even temperature. It does this by circulating hot water through the brew pan and around the portafilter, making sure that it is always at the correct temperature to extract. This is vital, because even a small difference in temperature can be the difference between a good and excellent espresso.

The Pump

Unlike manual piston machines, which rely on a lever that pressurize water, rotating espresso machines rely upon motorized pumps that provide the nine atmospheric bars of pressure necessary for retro espresso maker extraction. This pressure builds up by removing tap water from a reservoir, and pumping it through a heat exchanger prior being pushed through the ground coffee inside the group head.

Pumps tend to be cheaper than piston-driven machines, and they tend to last longer. However, both types of machine can get damaged through overuse and lack of cleaning. Pumps are also more complicated mechanically, which can increase the price of even the simpler models.

Some espresso machines can eliminate the pump entirely and make use of steam pressure to make espresso. The disadvantage of this is that the boiler that produces steam also increases the temperature of water to boiling and can result in over-extraction. The machines must also constantly rebuild their pressure in between cups. This requires energy and time.

Many espresso machines make use of the rotary or vibration pump, which has a vibration model that uses a vibrating disc to generate the pressure and a rotary model pushing hot water through the grounds at high speed. Both types of machine can make excellent espresso, however rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler is the element that heats water to the ideal temperature for extraction. The steam that is produced is then directed to the portafilter, which holds the espresso and filter coffee machine grounds. It is then funneled into the cup. In this process, the steam causes pressure to push through the grounds of the coffee. This results in a layer of crema on top. This is a hallmark of a great espresso.

There are three types of espresso machine uk makers, and they differ in the type of pump they employ and how hot the espresso is. There are various ways that the brew may be controlled as well as the size of the cup the maker can create.

The first espresso coffee machine machines were steam-types. The first espresso machines were steam-type machines. The coffee tasted bitter and burnt. This is why Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine.

The most popular espresso machine is a semiautomatic model with an electric pump. When people think of espresso machines, they picture these machines. Semi-automatic machines require you to grind and tamp the beans yourself, but the pump regulates the flow of water and pressure. This is an excellent compromise between human touch and the mechanised accuracy.

The Filter

Espresso machines typically have a filter that separates the grounds of coffee from hot water. The filter is also an essential part of the temperature control system as it prevents the machine from overheating.

Filters also aid in flavor, as it permits an extended flowering time. This allows beans to release their flavors and provides an opportunity for better extraction.

It is important to remember that even the most efficient filter can produce a bad cup of coffee. The quality of the beans, as well as the extraction, are still very important.

It's in this area that the magic occurs. This is what makes espresso taste so delicious. The grouphead (also known as the brewhead) is where you put the portafilter, which is the thingy used to place the grounds of your coffee into while making espresso.

In an espresso machine that is driven by steam, hot water is heated in an airtight container to create steam. This then pushes the hot water through the grounds under high pressure. These types of machines tend to be less expensive and simpler to maintain than pumps-driven models. They are however limited to create the perfect conditions for brewing as they only operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars.

In recent times, espresso machines powered by compressed air-pump are becoming increasingly popular. They utilize an air compressor to push hot water through the ground. They are also more mobile than electric steam-driven espresso machines.